C# - FCL/Form & Control Validation. John Kelleher. Validating Controls. Ensure correct data is input Validating event Raised when control is asked to validate contents Programmer writes event handler If contents found to be invalid programmer can notify user
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private ErrorProvider errorProvider = new ErrorProvider();
Private void textbox_Validating(object sender, CancelEventArgs e)
string errText = “”;
if (textbox.Text.Length == 0)
e.Cancel = true;
errText = “This field must not be empty”;